un·der·rate /ˌʌndə(r)ˈret/
  (vt.)低估,估計過低,看輕
  Un·der·rate v. t. To rate too low; to rate below the value; to undervalue.
  Un·der·rate n. A price less than the value; as, to sell a thing at an underrate.
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  underrate
       v : make too low an estimate of; "he underestimated the work
           that went into the renovation"; "Don't underestimate the
           danger of such a raft trip on this river" [syn: underestimate]
           [ant: overestimate]